Serra Bestiary

Enchant Creature    (CMC:2)

During your upkeep, pay or bury Serra Bestiary. Enchanted creature cannot attack, block, or play any ability that includes in its activation cost.

5E • ENSteve Luke

™ & © 1993—1997 Wizards of the Coast

Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

Serra Bestiary {W}{W} Enchantment — Aura Enchant creature At the beginning of your upkeep, sacrifice Serra Bestiary unless you pay {W}{W}. Enchanted creature can't attack or block, and its activated abilities with {T} in their costs can't be activated.

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View this MTG card on Gatherer

10/4/2004
Does prevent the use of activated mana abilities with {Tap} in the cost.
7/1/2013
Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder texts.

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Card Serra Bestiary is not on TCGPlayer.